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2-4.LDO稳压器浪涌电流抑制功能
当输入电压从0V上升至最小工作电压时，LDO稳压器导通提供稳定输出电压。此时，内部误差放大器以最大驱动力驱动VIN 和VOUT引脚之间的输出晶体管，将输出电压提高到设定水平。输出电压达到设定水平后，LDO稳压器将保持在该电平。然而，内部电路延迟等情况会导致输出电压过冲，超过负载IC或电路额定电压。
此外，大浪涌电流进入LDO稳压器，会给连接VOUT 引脚的输出平滑电容器充电。从LDO稳压器导通到输出电压达到稳定状态，这个过程会产生浪涌电流。如果VIN 引脚连接的电路板布线阻抗大，输入电压会由于电路板布线阻抗因浪涌电流产生的压降而下降。因此，LDO稳压器无法产生正常水平的输出电压。
浪涌电流限制功能可以防止这种情况。
LDO稳压器导通后，缓慢提升输出电流，同时限制浪涌电流，从而抑制输出电压过冲和输入电压下降。因此，浪涌电流限制有助于提高系统稳定性。
浪涌电流限制也称斜率控制或软启动。
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